[Qmulus]

I do believe there are differences in the firmware between the '01-'02 and '03+ 996 (and 986 for that matter) clusters, but I don't know what exactly they are. I have the tools to program the micro controller, but I haven't played with that part yet.

I have an '02 cluster in my '03, and one difference is that the '03 with MOST optical bus for the audio system uses the cluster to compare to the headunit for security. You do need to program the cluster for the headunit or you will end up having a locked up radio at some point, maybe eve immediately. BTDT.

I have gone through and read a bunch of various (turbo, Carrera 2, Carrera 4, Carrera 4s, Cabs, etc.) 996 clusters (I have the ability to read and write the EEPROM through the OBD2 port) and found you can do some weird things on these clusters, like enabling the boost pressure display from the 996 Turbo on a 986 cluster that has the dot matrix display. Not really useful, but kinda cool.. I have started to make a memory map of the different functions, but like everything, there is only so much time I can spend playing with stuff...